/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/Mechanics/CurveControlPointsMechanic.h
Adds additional line to snap points to. Useful, for instance, if the curve is a revolution profile curve and needs to be able to snap to the revolution axis.
void AddSnapLine ( int32 LineID, const [UE::Geometry::FLine3d](API\Runtime\GeometryCore\FLine3d) & Line )